Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data (unaudited) - Additional Information (Details)

v3.3.1.900
Selected Quarterly Financial Data (unaudited) - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Selected Quarterly Financial Data [Line Items]                    
Increase (decrease) in Gross Profit       $ 57,946 $ 58,225 $ 52,873 $ 60,636 $ 269,907 $ 229,680 $ 228,701
Restatement Adjustment                    
Selected Quarterly Financial Data [Line Items]                    
Increase (decrease) in Gross Profit $ 1,000 $ 1,000 $ 100